American Water Heater U273-1373(01) User manual

Brand: American Water Heater

Model: U273-1373(01)

Type: User manual

705 Indoor

U273-1373(01)

705(Indoor)

705(Indoor-ASME)

Power interruption during Bath fill (Water will not flow when

power returns)

• Turn off all hot water taps. Press ON/OFF twice.

Error Codes

• Ensure approved venting materials are being used.

• Check that nothing is blocking the flue inlet or exhaust.

• Check all vent components for proper connections.

• Ensure vent length is within limits.

• Ensure condensation collar was installed correctly.

• Verify dip switches are set properly.

• Check fan for blockage.

Air Supply or Exhaust Blockage

• Check that the gas is turned on at the water heater and gas

meter. Check for obstructions in the flue outlet.

• Ensure gas line, meter, and/or regulator is sized properly.

• Ensure gas type and pressure is correct.

• Bleed all air from gas lines.

• Ensure proper venting material was installed.

• Ensure condensation collar was installed properly.

• Ensure vent length is within limits.

• Verify dip switches are set properly.

• Ensure appliance is properly grounded.

• Disconnect keypad.

• Disconnect multi-unit connections to isolate the problem.

• Check power supply for loose connections.

• Check power supply for proper voltage and voltage drops.

• Ensure flame rod wire is connected.

• Check flame rod for carbon build-up.

• Disconnect and re-connect all wiring harnesses on unit and PC

board.

• Check all components for electrical short.

• Check gas solenoid valves for open or short circuits.

• Remove burner plate and inspect burner surface for

condensation or debris.

Flame Failure

• Service Call

No burner operation during freeze protection mode

• Check that the gas is turned on at the water heater, gas meter,

or cylinder.

• Ensure gas type and pressure is correct.

• Ensure gas line, meter, and/or regulator is sized properly.

• Bleed all air from gas lines.

• Verify dip switches are set properly.

• Ensure appliance is properly grounded.

• Disconnect multi-unit connections to isolate the problem.

• Ensure igniter is operational.

• Check igniter wiring harness for damage.

• Check gas solenoid valves for open or short circuits.

• Remove burner cover and ensure all burners are properly

seated.

• Remove burner plate and inspect burner surface for

condensation or debris.

No Ignition

• Check gas type of unit and ensure it matches gas type being

used.

• Check for restrictions in air flow around unit and vent terminal.

• Check for low water flow in a circulating system causing short-

cycling.

• Ensure dip switches are set to the proper position.

• Check for foreign materials in combustion chamber and/or

exhaust piping.

• Check heat exchanger for cracks and/or separations.

• Check heat exchanger surface for hot spots which indicate

blockage due to scale build up. Refer to instructions in manual

for flushing heat exchanger.

• Measure resistance of safety circuit.

• Ensure high fire and low fire manifold pressure is correct.

• Check for improper conversion of product.

Thermal Fuse

• Check for restrictions in air flow around unit and vent terminal.

• Check for low water flow in a circulating system causing short-

cycling.

• Check for foreign materials in combustion chamber and/or

exhaust piping.

• Check for clogged heat exchanger.

Over Temperature Warning

• Check sensor wiring for damage.

• Measure resistance of sensor.

• Clean sensor of scale build up.

• Replace sensor.

Outgoing Water Temperature Sensor Fault

• Check sensor wiring for damage.

• Measure resistance of sensor.

• Clean sensor of scale build up.

• Replace sensor.

Heat Exchanger Outgoing Temperature Sensor Fault

• Check for restrictions in air flow around unit and vent terminal.

• Check sensor wiring for damage.

• Measure resistance of sensor.

• Clean sensor of scale build up.

• Ensure fan blade is tight on motor shaft and is in good

condition.

• Replace sensor.

Combustion Air Temperature Sensor Fault

• Check modulating gas solenoid valve wiring harness for loose

or damage terminals.

• Measure resistance of valve coil.

Modulating Solenoid Valve Signal Abnormal

• Ensure fan will turn freely.

• Check wiring harness to motor for damaged and/or loose

connections.

• Measure resistance of motor winding.

Combustion Fan Failure

If blank screen is present on remote control then the flow control

has shorted out. Unplug flow control. If remote lights up and unit

starts operating then replace flow control assembly.

Water Flow Servo Faulty (does not stop flow properly)

• Check wiring harness to all solenoids for damage and/or loose

connections.

• Measure resistance of each solenoid valve coil.

SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault

• Ensure flame rod is touching flame when unit fires.

• Check all wiring to flame rod for damage.

• Remove flame rod and check for carbon build-up; clean with

sand paper.

• Check inside burner chamber for any foreign material blocking

flame at flame rod.

• Measure micro amp output of sensor circuit with flame present.

• Replace flame rod.

Flame Sensing Device Fault

• Flush heat exchanger. Refer to instructions in manual.

• Replace heat exchanger.

Scale Build-up in Heat Exchanger (when checking

maintenance code history “00” is substituted for “LC”)

• Clean inlet water supply filter.

• On new installations ensure hot and cold water lines are not

reversed.

• Check for bleed over. Isolate unit from building by turning off

hot water line to building. Isolate the circulating system if

present. Open your pressure relief valve; if unit fires, there is

bleed over in your plumbing.

• Ensure you have at least the minimum flow rate required to fire

unit.

• Ensure turbine spins freely.

• Measure the resistance of the water flow control sensor.

• Remote control does not light up but you have 12 VDC at the

terminals for controls.

No Code (Nothing happens when water flow is activated.)

Wiring Diagram

Dip SW1

MIN

MAX

MODULATING VALVE

CURRENT ADJUSTING

Gas pressure

OUTGOING WATER

WATER THERMISTOR

HEAT EXCHANGER

WATER THERMISTOR

BRROYW

BKRW

2-Unit Connection

(Optional)

WATER FLOW

SENSOR

BY-PASS FLOW

CONTROL DEVICE

YBKR

FREEZE PROTECTION

(OPTIONAL)

WWP

WATER FLOW

CONTROL DEVICE

BL BR

COMBUSTION FAN

MODULATING

SOLENOID VALVE

POV

FLAME ROD

SV1

SV0

SV2

MAIN SOLENOID VALVE

SOLENOID VALVE 1

(CENTER)

SOLENOID VALVE 2

(LEFT)

OBKO

(CN2)

12 1

SOLENOID VALVE 3

(RIGHT)

SV3

IGNITER

GND

FUSE

(3A)

AC120VAC120V

HOT

NEUTRAL

HOT

NEUTRAL

GROUND

GND

REMOTE CONTROLLER

SPARK

ELECTRODE

Spare Parts Only

Gas type

Dip SW2

(CN3)

(CN4)

(CN1)

(CN12)

(CN5)

(CN7)

(CN9)

WBK

G/Y

SURGE

PROTECTOR

GND

THERMAL FUSES

OVERHEAT

SWITCH

COLOR CODING

W :White

BK:Black

BR:Brown

R :Red

BL:Blue

Y :Yellow

P :Pink

O :Orange

G :Green

GY:Gray

BL BL

ANTI-FROST

HEATER

FROST SENSING

SWITCH

G/Y

705(Indoor)

705(Indoor-ASME)

Water

Inlet Max.

Gas Inlet

Min./Max

Forced Low Forced High

NAT.G

5"W.C.

/10.5"W.C.

8"W.C.

/13.5"W.C.

LPG NAT.G LPG NAT.G LPG

.C.W"7.3.C.W"0.3.C.W"38.0.C.W"76.0ISP 051

Table 1

NAT.GLPG

Regulator adjustment

screw access plug

Burner

test point

SW1

SW2

High Pressure

Potentiometer

Spare Parts

Only

Outgoing Water Thermistor:

White - White N / A See example above F4 3 - 4

Heat Exchanger Temperature Thermistor:

Pink - White N / A See example above F3 3 - 11

Surge Protector:

Black - White 108 ~ 132 VAC N / A D2 1 - 3

Black - White 108 ~ 132 VAC N / A D1 1 - 3

Remote Controls:

Te rminals B1 10 ~ 13 VDC 1.5 ~ 3.0 K ohms B 1 - 3

(SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)

(Main) Pink - Black

Wire color Voltage Resistance Connector # Pin #'s

11 ~ 13 VDC 24 ~ 28 ohms H3 6 - 7

(SV1) Black - Red 11 ~ 13 VDC 37 ~ 43 ohms H4 5 - 6

(SV2) Black - Orange 11 ~ 13 VDC 37 ~ 43 ohms H5 4 - 6

(M) Water Flow Control Device Servo or Geared Motor:

NOTE: The grey wire listed above turns to black at F connector on the PCB.

Set your meter to the hertz scale. Reading across the white and black wires at terminals 2 and 4

you should read between 60 and 420 hertz.

Grey - Brown 4 ~ 6 VDC N / A F5 5 - 7

Red - Blue 11 ~ 13 VDC 22 ~ 28 ohms F5 9 - 10

(QS) Water Flow Sensor:

Black - Red 11 ~ 13 VDC 5.5 ~ 6.2 K ohms F2 1 - 3

(IG) Ignition System:

Grey - Grey 90 ~ 110 VAC N / A C1 1 - 2

Yellow - Black 4 ~ 7 VDC 1 ~ 1.4 Mega ohms F2 2 - 3

Thermal Fuse / Overheat Switch:

Red - White 11 ~ 13 VDC Below 1 ohms

F6 - H12

Grey - Yellow N / A N / A F5 5 - 8

(FM) Combustion Fan Motor:

White - Black 5 ~ 10 VDC 9.2 ~ 9.4 K ohms E1 2 - 4

Red - Black 6 ~ 45 VDC N / A E1 1 - 2

Yellow - Black 11 ~ 13 VDC 3.5 ~ 3.9 K ohms E1 2 - 3

By-pass Flow Control:

Orange - White 2 ~ 6 VDC

15 ~ 35 ohms

G1 2 - 5

Yellow - White

(Unit in operating mode)

G1 3 - 5

5 - 11GetihW - nworB

5 - 41GdnuorG - etihW-deR

(SV3) Black - Yellow 11 ~ 13 VDC 37 ~ 43 ohms H6 3 - 6

(POV) Orange - Orange

2 ~ 15 VDC 67 ~ 81 ohms H2 9 - 10

Gas Pressure Setting

APPLIANCE OPERATING PRESSURES

Controller

Thermostat

ON/OFF Button

In Use Indicator

Indicates that hot water

is being supplied.

Temperature Display

Indicates temperature

setting or flashes error

code.

Priority Indicator

Indicates that this

controller is setting the

water temperature.

Priority Button

When no water is

being supplied,

pressing this button

allows this controller to

set the water

temperature.

Diagnostic Use of the Controller

1. To display error codes, press the ON/OFF button followed by

the thermostat button to cycle through the error codes.

2. To display the water flow through the water heater, press the

thermostat button (hold for 2 seconds) and then press the

ON/OFF button while continuing to hold the thermostat

button.

3. To display the outlet water temperature, press the thermostat

button (hold for 2 seconds) and then press the ON/OFF button

while continuing to hold the thermostat button.

To Change the Temperature Scale (ºF / ºC)

With the water heater turned off, press and hold the ON/OFF

button until the display changes to the other temperature scale

(about 5 seconds).

To Turn Off the Controller Sound (Mute)

To turn the sound off (mute), press and hold both the and

thermostat buttons until a “beep” is heard (about 5 seconds).

NOTE: For additional installation and commissioning information refer

to the Operation and Installation Manual.

This appliance must be installed, serviced and removed by a trained

and qualified person. During pressure testing of the consumer piping,

ensure gas valve is turned off before unit is shut off. Failure to do so

may result in serious injury to yourself or damage to the unit.

Commissioning

With all gas appliances in operation at maximum gas rate, the

flowing inlet pressure at the incoming test point on the Rinnai

water heater should read 5" W.C. - 10.5" W.C. on natural gas

and 8" W.C. - 13.5" W.C. on propane gas. If the pressure is

lower, the gas supply is inadequate and the unit will not operate

to specification. Check the gas meter regulator and pipework for

correct operation/sizing and correct as required.

Gas Pressure Setting

Ensure gas pressure check under Commissioning has been

completed first! The regulator is electronically controlled and

factory pre-set. Under normal circumstances it does not require

adjustment during installation. Make adjustments only if the unit is

not operating correctly and all other possible causes for incorrect

operation have been eliminated.

1. Turn OFF the gas supply.

2. Turn OFF the 120 V power supply.

3. Remove the front panel from the appliance.

4. Check the gas type using the data plate on the side of the unit.

If using a spare PC board, check that the gas type switches are

in the correct position (dip switch 1 of SW2: ON for natural gas,

NG, and OFF for propane, LPG). See dip switch settings

section below. (ON is towards the right and OFF is towards the

left.)

5. Attach the pressure gauge to the burner test point, located on

the gas control (Fig. 2).

6. Turn ON the gas supply.

7. Turn ON the 120 V power supply.

8. If a controller is installed, turn the unit ON with the controller.

Select the maximum delivery temperature and open all

available hot water taps at full.

9. Set the unit to ‘Forced Low’ combustion by setting No. 7 dip

switch of the SW1 set to ON (Fig. 3).

10. Check the burner test point pressure.

11. Remove the rubber access plug and adjust the regulator screw

on the modulating valve (Fig. 4) as required in Table 1.

Replace the rubber access plug.

12. Set the unit to ‘Forced High’ combustion by setting both No. 7

and No. 8 dip switches of the SW1 set to ON (Fig. 5). Ensure

maximum water flow.

13. Check the burner test point pressure.

14. Adjust the high pressure potentiometer (POT) on the PC board

as required to the pressure shown in Table 1.

15. Return the unit to normal operation by setting dip switches 7

and 8 of the SW1 set back to OFF (Fig. 6). Close all water

taps.

16. Turn OFF the gas supply and 120 V power supply.

17. Remove the pressure gauge and install sealing screw.

18. Turn ON the gas supply and 120 V power supply.

19. Operate the unit and check for gas leaks at the test point.

20. Install the front panel.

WARNING

Troubleshooting

Important Safety Notes

There are a number of (live) tests that are required when fault

finding this product. Extreme care should be used at all times to

avoid contact with energized components inside the water heater.

Only trained and qualified service technicians should attempt to

repair this product. Before checking for resistance readings,

disconnect the power source to the unit and isolate the item from

the circuit (unplug it).

Heat Exchanger and Outgoing Water Temperature

Thermistors:

Check all thermistors by inserting meter leads into each end of the

thermistor plug. Set your meter to the 20 K scale and read

resistance. Applying heat to the thermistor bulb should decrease

the resistance. Applying ice to the thermistor bulb should increase

the resistance. See below for examples of typical temperatures and

resistance readings.

140

F = 2.2 ~ 2.7K

221

F = 0.6 ~ 0.8K

F = 11.4 ~ 14K

86°F = 6.4 ~ 7.8K

113

F = 3.6 ~ 4.5K

Example:

With the power off you can check the continuity through the surge

protector. Place a meter lead on the top pin #1 of the surge

protector and pin #3 on the bottom of the surge protector. Check

across the top pin #3 and bottom pin #1. If you read continuity

across these two points then the surge protector is good. If you do

not get continuity then replace the surge protector.

Frost Protection:

This unit has frost protection heaters mounted at different points to

protect the water heater from freezing. The heaters located on the

hot water outlet line should have a resistance reading of 180-207

ohms through each of these heaters. The heater located on the

heat exchanger piping should have a resistance reading of 156-180

ohms and the one located in the water flow sensor valve should

have a resistance reading 24-28 ohms.

Amp Fuses:

This unit has one inline (3) amp glass fuses. Remove the fuse and

check continuity through it. If you have continuity through the fuse

then it is good. Otherwise the fuse is blown and must be replaced.

Flame Rod:

Place one lead of your meter to the flame rod and the other to ground.

With the unit running you should read between 5-150 VAC. Set your

meter to the µ amp scale and series your meter in line with the flame

rod. You should read 1 µ amp or greater for proper flame circuit. In

the event of low flame circuit remove the flame rod and check for

carbon or damage.

Dip Switches Settings

NOTES

No.

Level 0

0-2000 ft

(0-610 m)

High Altitude

Level 1

2001-5200 ft

(610-1585 m)

Level 2

5201-7700 ft

(1585-2347 m)

Level 3

7701-10200 ft

(2347-3109 m)

Off

Adjust switches 2 and 3 in the bank of 8 depending on

your altitude according to the table below.

The original PC boards on the water heaters do not

have the bank of 6 dip switches. Only spare PC

boards have this bank.

High Altitude

WARNING

DO NOT adjust the other dip switches unless specifically instructed

to do so. Incorrect Dip Switch Settings can cause the water heater

to operate in an unsafe condition and may damage the water heater

and void the warranty.

Fig. 1 Fig. 2

Fig. 3 Fig. 4

Fig. 5 Fig. 6

070 00012 36676 0

EXPLODED VIEW - CABINET EXPLODED VIEW - INTERNALS

EXPLODED VIEW - ELECTRICALEXPLODED VIEW - INTERNALS

PA RTS LIST

Parts Number

701022-150

701022-154

701022-155

701022-159

701022-160

701022-162

701022-163

701022-164

701022-165

701022-023

701022-008

701022-020

701022-166

701022-167

701022-168

701022-169

701022-170

701022-027

701022-171

701022-172

701022-173

701022-174

701022-175

701022-153

701022-182

701022-183

701022-036

701022-184

701022-185

701022-039

701022-093

701022-186

701022-187

701022-188

701022-189

701022-158

705

(Indoor)

705

(Indoor-ASME)

Description

Casing Assembly

Heat Protection Plate

Front Panel Assembly

Remote Controller Packing

Wall Fitting Bracket

Front Panel Packing-Top

Front Panel Packing-Side

Connection Reinforcement Panel

Bag for Installation Manual

Seal Packing

Rubber Bushing

Reinforcement Plate

Air Intake Vent

100 Seal Plate

Duct Bracket

Fan Rectifier

Gas Connection (3/4"NPT)

Screw

Gas Control Kit

Manifold Assembly-A (LPG)

Manifold Assembly-B (Nat.G)

Burner Unit Assembly(Nat.G)

Burner Unit Assembly(LPG)

Combustion Chamber Front Plate

Combustion Chamber Front Plate Packing

Electrode Kit

Flame Rod Kit

Electrode Packing

Electrode Holder

Electrode Sleeve

Solenoid Valve Cover

Upper Combustion Chamber Packing

Lower Combustion Chamber Packing

Heat Exchanger Kit

Heat Exchanger Kit(ASME)

Number

001

002

004

005

007

010

011

012

013

014

015

017

018

019

020

021

022

100

101

102

103

104

113

114

115

116

117

118

121

122

123

124

125

Parts Number

701022-191

701022-192

701022-193

701022-194

701022-195

701022-197

701022-198

701022-199

701022-069

701022-200

701022-082

701022-203

701022-204

701022-074

701022-075

701022-205

701022-206

701022-207

701022-081

701022-208

701022-209

701022-210

701022-211

701022-088

701022-213

701022-091

701022-214

701022-215

701022-216

701022-102

701022-151

701022-218

701022-219

701022-221

701022-222

701022-120

Number

131

132

133

150

151

153

154

155

400

401

402

405

406

407

408

409

410

411

412

413

700

701

702

703

704

705

706

707

708

709

710

711

712

714

715

716

Description

Flue Outlet Vent Packing

Flue Outlet Vent Assembly

ϕ 100 Packing

Blower Motor

Fan Casing Assembly

Fan Connecting Bracket

Fan Connecting Packing

39 Bell Mouth

Water Inlet (3/4"NPT)

Plug Band

Water Filter Assembly

Water Flow Control Assembly Kit

Rectifier

Bypass-Servo Assembly

Stop Bracket

Water Flow Servo Cover

Hot Water Outlet (3/4"NPT)

Plug Band

Drain Valve

Stop Bracket

PCB

Surge Protector

PCB Cover-Front

PCB Cover-Side

Ignitor Bracket

Ignitor

High Tension Cord

Ignitor Cover

120V Anti Frost Heater Assembly

Anti Frost Heater Clip

120V Valve Heater Assembly

Thermal Fuse Harness

Thermal Fuse Clip

Thermistor

Parts Number

701022-095

701022-223

701022-224

701022-226

701022-227

701022-228

701022-107

701022-229

701022-231

701022-122

701022-232

701022-233

701022-128

701022-234

701022-121

701022-235

701022-236

701022-237

701022-238

701022-125

701022-137

701022-133

701022-134

701022-135

701022-136

701022-130

701022-239

701022-240

701022-241

701022-141

701022-242

701022-142

315897-000

701022-244

701022-246

701022-247

Description

Thermistor Clip

Frost Sensing Switch

Fuse Harness

Power Supply Harness

Ignitor Harness

Sensor Harness

Power Cord

Remote Controller

Remote Controller Bracket

Screw

Washer

Screw

Washer

Screw

O-ring

Packing

Screw

Manual

Installation Manual (Tech Sheet)

Package Spec Sheet

Manual 3/4" Gas Control Valve

Number

717

718

720

721

722

723

724

725

726

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

820

821

822

823

824

888

889

Quantity

705

(Indoor)

705

(Indoor-ASME)

Quantity

705

(Indoor)

705

(Indoor-ASME)

Quantity

REMOTE CONTROLLER

703

American Water Heater U273-1373(01) User manual

American Water Heater U273-1373(01) User manual

American Water Heater U273-1373(01) User manual

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